The stick ended up being a bit lumpy, but that was okay. The first batch went completely flat, so I ended up dropping the oven temperature and the time for the second batch. Those decided to crack a little when I went to unbend them, but cooperated with being squished together into a roughly cylindrical mass instead.
I wrapped the result in brown paper labelled 'Stick', alongside two Cookies-and-Cream bars wrapped in aluminum foil labelled 'Iron', and put them and the wrapped box with the pick USB in it in a larger box filled with packing peanuts.
The catch-phrase from this Christmas was 'I got a stick!'
(She loved it all!)